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Apple core lesion (ba enema) 

Circumferential narrowing of the lumen secondary to colon cancer.

Ball on tee sign

Sign of papillary necrosis on IVU.

Bamboo spine

Ankylosing spondylitis

Banana sign (antenatal US)

Refers to a banana-shaped configuration of the cerebellum. Associated with neural tube defects.

Bat wing appearance (chest) 

Classic chest radiography finding for pulmonary edema.

Bat wing appearance (MRI brain) 

Appearance of 4th ventricle that may be seen with joubert syndrome.

Blade of grass sign

Paget's disease (seen in leg bones)

Blood fluid levels (MRI)


Bone bruise sign

Acl tear

‘Bone In Bone’/Endobone Sign


Bowler’s hat sign (ba enema)

Colonic polyp

Bow Tie Sign (MRI knee)

Discoid meniscus

Boxcar ventricles

Appearance of frontal horns that may be seen in huntington's disease.

Breast in a breast sign

Term used to describe fibroadenolipomas.

Brim Sign

Paget's disease

Bulging Fissure Sign (CXR) 

Klebsiella pneumonia.

Bullet carpal bones

Appearance of carpal bones that may be seen with mucopolysaccharidoses.

Button Sequestrum

Eosinophilic granuloma

C Sign

Subtalar coalition

Canoe paddle ribs

Appearance of ribs that may be seen with mucopolysaccharidoses.

Carman’s meniscus sign (ba meal)

Malignant gastric ulcer

Celery stalking

Irregular appearance of metaphyses in patients with rubella. Also used to describe metaphyses in patients with osteopathia striata.

Central dot sign (doppler) 

Sign of caroli's disease.

Champagne-glass pelvis


Champagne sign

Specific but not commonly seen ultrasound finding for emphysematous cholecystitis.

Cloverleaf skull 

Appreance of the skull that may be seen with thanatophoric dysplasia

Coffee bean sign

Sigmoid Volvulus.

Comet Sign

Sign to differential a phlebolith from a ureteral stone. Calcified phlebolith represents the comet nucleus and the adjacent, tapering, noncalcified portion of the vein is the comet tail (also see soft-tissue rim sign).

Comet Tail Sign

Produced by the distortion of vessels and bronchi that lead to an adjacent area of round atelectasis.

Corkscrew esophagus

Diffuse esophageal spasm & presbyesophagus

Corkscrew sign (upper gi Series)

Midgut volvulus

Corduroy vertebral body

Appearance of thickening trabeculations seen in vertebral hemangiomas. (polka-dot sign on ct).

Cotton Wool Skull

Paget's disease

Crazy-Paving Sign (HRTC lung) 

Nonspecific appearance consisting of linear network or reticular pattern with areas of ground-glass opacification. Classically associated with pulmonary alveolar proteinosis.

Crescent Sign (x-ray)

Avascular necrosis

Crowded Carpal Sign

Volar perilunar dislocation

Dagger Sign

Ankylosing spondylitis

Deep Lateral Femoral Notch Sign

Acl tear

Double track sign 

Appearance of hypertrophic pyloric stenosis that may be seen on upper gi series.

Drooping Shoulder Sign

Inferior subluxation of the shoulder

‘Egg on a string’  heart


Eye Of The Tiger Sign (MRI brain; coronal) 

Low signal intensity circumscribing the globus pallidus in patients with hallervorden-spatz disease.

Empty delta sign

Sign of intracranial dural sinus thrombosis.

Epicardial fat pad sign 

Sign of a pericardial effusion.

Fallen Fragment sign

Unicameral bone cyst

FBI Sign


Feeding vessel sign (CT chest) 

Sign of pulmonary septic emboli. Can be seen with lung metastases. At times in wg.

Figure 3 sign (CXR) 

Appearance of the aorta that may be seen in patients with coarctation of the aorta.

Figure of eight (MRI brain)

Appearance of the brain in lissencephaly.

Finger in glove sign

Sign of mucous plugging seen with allergic bronchopulmonary aspergillosis.

fish vertebra


Flaring of anterior ends of ribs


Football sign (CXR)

Pneumoperitoneum (seen on supine radiographs).

Fragment-In-Notch Sign

Bucket-handle tear of the menisci

Frostburg’s reverse ‘3’ sign

Carcinoma head of pancreas (hypotonic duodenography)

Golden ‘s’ sign (CXR)

Right upper lobe atelectasis created by a central mass.

Groundglass apperance

Fibrous dysplasia of Bone

H-Shaped Vertebra

Sickle cell anemia

Hair On End skull

Hemolytic anemia

Half Moon Sign

Absent in posterior dislocation of the shoulder

Hampton's hump 

Triangular opacity secondary to infarction in the periphery of the lung distal to a pulmonary embolism.

Juxtaphrenic peak sign (CXR)

Tenting of the diaphragm that may be seen with right upper lobe atelectasis.

Keyhole Sign (USG)

Us appearance that may be seen with posterior urethral valves.

Lace like pattern (X-RAY)

Pattern that may be seen with sarcoid arthropathy.

Lacunar skull

Appearance of skull that may be seen in infants with chiari ii malformation.

Lambda sign (gallium-67 citrate scan)

Uptake in the hilar and paratracheal lymph nodes gives the appearance of a lambda. This is seen in sarcoidosis.

Lateral Capsular Sign

Acl tear - segund fracture

Lead pipe colon (ba enema)

Narrowing of colon with loss of haustra that may be seen in patients with ulcerative colitis.

Lemon sign (antenatal US)

Refers to shape of calvarium associated with spina bifida.

Linguine sign (MRI breast)

Mri sign that may be seen in patients with intracapsular breast implant rupture.

Lobster claw sign (IUV)

Sign of papillary necrosis.

Luftsichel sign (CXR)

"air cresent". Sign that may be seen with left upper lobe atelectasis.

Medusa-lock sign

Round worm infesation

Metacarpal Sign

Short 4th metacarpal

Molar tooth sign (CT cystogram)

Perivesicular extravasation of contrast on ct cystogram in a patient with extraperitoneal bladder rupture.

Molar Tooth Sign (CT/MRI brain)

joubert syndrome.

Mount fuji sign (CT brain)

Tension pneumocephalus.

Moulage sign (enteroclysis)

Effaced loop of bowel that may be seen on a small bowel series in sprue.

Naclerio's v sign (CXR)

V shaped lucency that may be seen over the left lower mediastinium in pneumomediastinum.

Nutmeg liver

Pattern of liver enhancement seen with passive congestion.

Nubbin sign

reflux nephropathy involving the lower pole of a duplicated collecting system.

Paintbrush appearance

Linear striations of contrast material opacifing collecting tubules that may be seen with medullary sponge kidney.

Parallel track sign

Pattern of uptake that may be seen on bone scan in patients with hypertrophic osteoarthropathy.

Panda Sign

On a gallium-67 citrate scan, uptake in the lacrimal and salivary glands gives the appearance of a panda. This is suggestive of sarcoidosis.

Pearl necklace sign

Mri sign that may be seen with adenomyomatosis.

Pedestal Sign

Loosening prosthesis

Pencil in cup deformity

Erosion pattern of digits that may be seen in patients with psoriatic arthritis.

Picket fence

Appearance of bowel that may be seen on small bowel series with whipple disease or gastrointestinal amyloidosis.

Picture frame vertebral body

paget disease.

Rosary sign

Ct sign that may be seen with adenomyomatosis.

Rugger Jersey Sign

Chronic renal failure

Sail Sign

Elbow effusion

Salt and pepper appearance on MRI


‘Salt and pepper’ skull


Saber-Sheath Trachea

Appearance of trachea that may be seen with copd.

Saber shin

Appearance of tibia that may be seen with syphilis.

Sandstorm appearance (CXR)

pulmonary alveolar microlithiasis.

Sandwich sign

Bulky lymphoma encasing mesenteric vessels.

Sandwich vertebra 

Sclerotic endplates that may be seen with osteopetrosis.

Sausage Digit


Scimitar sign

Mri appearance that may be seen with eccentric cystic adventitial disease.

Scottie dog sign

On oblique radiographs, the posterior elements form the appearance of a scottie dog. Spondylolysis can have the appearance of a collar around the neck.

Shepard's Crook Deformity

Appearance of proximal femur that may be seen with fibrous dyplasia.

Shoulder sign (ba meal)

Appearance of hypertrophic pyloric stenosis that may be seen on upper gi series.

‘Sitting duck’ heart

Persistent truncus arteriosus

Snowman’s heart (figure of ‘8’ or cottage loaf heart) 

Supracardiac total anomalous pulmonary venous connection.

Snowstorm pattern (breast) 

Us pattern for breast implant rupture.

Snowstorm pattern (CXR) 


Snowstorm pattern (ob/gyn) 

Us pattern for a molar pregnancy.

Soft-Tissue Rim Sign

Appearance of a ureteral edema surrounding a calculus. Helps differentiates a calculus from a phlebolith (also see comet sign).

Spade shaped tufts 

Shape of tufts that may be seen with acromegaly.

Spalding sign

Overlapping cranial sutures. Sign of fatal demise on prenatal ultrasound.

Spider web

Appearance of collateral vessels that may be seen on hepatic venography in budd-chiari syndrome.

Signet ring sign (chest CT) 

Sign of bronchiectasis.

Strawberry skull

Appearance of skull that may be seen on fetal us with trisomy 18.

Starry sky sign 

Ct appearance that may be seen withneurocysticercosis.

Starry sky sign

Us appearance that may be seen with hepatitis.

Stripe sign

On a v/q scan, subpleural activity in a region of decreased pulmonary perfusion. Sign is used to rule out pulmonary embolism.

Step-Off Vertebral Body Sign

Sickle cell, gaucher's disease

String sign

Ileocaecal tb, hypertrophic pyloric stenosis, crohn’s disease (seen on upper gi series).

String of beads sign

Small bowel obstruction

Swan Neck Deformity

Rheumatoid arthritis

Target sign 





Hepatic candidiasis and liver metastases.

Tau sign (MRI)

persistent trigeminal artery

Tip of the iceberg sign

Ultrasound sign that may be seen with mature cystic teratomas.

Tit sign

:appearance of hypertrophic pyloric stenosis that may be seen on upper gi series.

Tear Drop Sign (Orbits)

Blowout fracture

Teardrop Sign (Ankle)

Ankle effusion

Telephone receiver shaped femora

Appearance of femora that can be seen with thanatophoric dysplasia.

Throckmorton's Sign

The penis points to the pathology.

Trolley-Track Sign (x-ray)

Ankylosing spondylitis

Trident hand

Appearance of hands that may be seen with achondroplasia.

Trough Line

In posterior shoulder dislocation, frontal radiographs reveal two nearly parallel lines in the superomedial aspect of the humeral head.

Tumbling Bullet Sign

Post traumatic bone cyst

Umbrella sign (on BMFT)

Sign of ic tb

Vacuum Phenomenon (CT/MRI)

Degenerative disk disease

Whirlpool sign

Us sign of midgut volvulus in a neonate.

Wimberger's ring sign

A circular, opaque radiologic shadow surroundsing epiphyseal centers of ossification in patients with scurvy.

Westermark's sign (CXR)

Regional pulmonary oligemia secondary to pulmonary embolism.

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